1. Definition of internal resistance:

　　The internal resistance of a lithium battery refers to the resistance experienced by the current passing through the battery during operation. It includes two parts: ohmic resistance and polarization resistance. Ohmic resistance is mainly composed of the resistance of electrode materials, electrolytes, separators, etc., and its magnitude is independent of current. Polarization internal resistance is caused by polarization phenomena during electrochemical reactions, and its magnitude is related to factors such as current and temperature.

　　2. The significance of internal resistance:

　　The size of internal resistance directly affects the output power, charging efficiency, discharging performance, and service life of the battery. Batteries with lower internal resistance can provide higher output current and power, with less energy loss during charging and lower voltage drop during discharge, resulting in better performance and longer lifespan.

　　Comparison and selection of measurement methods:

　　Comparison of Measurement Methods

　　1. Method comparison: The DC internal resistance measurement method is suitable for quickly evaluating the internal resistance of batteries, but the measurement results may be affected by polarization phenomena. The communication internal resistance measurement method has high measurement accuracy, but the equipment is complex and the cost is high.

　　2. Selection criteria: Choose the appropriate measurement method based on factors such as measurement purpose, accuracy requirements, cost budget, and measurement conditions. On the production line, a rapid DC internal resistance measurement method is usually used for preliminary screening; In scientific research and quality control, higher precision AC internal resistance measurement methods may be used.

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